Hole in head

[sdurnal]

I know I run her hard with a 50" deck, but noticed a different sound last time I mowed. I assumed the head gasket went. Nope, a hole blew through the head near the spark plug. I'm suspecting a crack, then gradual erosion of the aluminum until a hole developed.. Anyone else heard of this?
K301 Kohler.

 

[Eugene]

I have had two aluminum heads with burnt holes. On mine the holes were above the head gasket, burning a hole in the side of the head.

Cause, unknown. The Cub Cadet engine ran for years with no head or head gasket problem.